| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a continuous casting method of steel preventing generation of surface crack in a vicinity of a bend-straightening point after drawing a cast slab. <P>SOLUTION: In the continuous casting method in which molten steel is charged in a mold, and a cast slab is directly drawn from the mold, a surface layer part of the cast slab is cooled to the temperature zone below the ferrite-pearlite transformation completion temperature and exceeding the bainite transformation starting temperature in the continuously cooling transformation diagram of the molten steel immediately below the mold, and thereafter, is kept in the temperature zone below the ferrite-pearlite transformation completion temperature and exceeding the bainite transformation starting temperature before being across the cooling curve passing through the nose of the ferrite-pearlite transformation in the continuously cooling transformation diagram. <P>COPYRIGHT: (C)2012,JPO&INPIT |
